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A fork
node is denoted by a black bar at which one fl ow ends, and from which an arbitrary
number of fl ows start. The incoming fl ow is ??? forked. ???
13For those who are well familiar with the UML metamodel: It??™s the composite relationship between
BehavioredClassifier (in this case the use case or system process) and Behavior (in this case the
activity).
FIGURE 2-48
A system process with use cases.
uc [package] Car usage [system process]
Car usage
Start car usage
End car usage
?«include?»
?«include?»
?«include?»
Show car usage
data
83 2.4 Modeling Use Cases
The display of usage data is a continuous use case. It is no longer exited in this
system process. When the use case end car usage is completed, the entire system
process and with it the usage data display are terminated over the activity fi nal node.
You will learn other description elements that are possible in activity diagrams
in Sections 2.4.5, 2.4.6, and 3.6.
You can just as easily represent a system process in the form of a function tree
( Figure 2.


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